I had a 1987 Chevy Celebrity that would start and then immediately die. It turned out to be bad fuel injectors. I replaced three fuel injectors and the problem has not returned.
My 1987 Chevy Celebrity with 2.8 V6 was doing the same thing. I cured the problem by replacing three dead fuel injectors.
The MAP sensor on a 1987 Chevy Celebrity is mounted to the firewall near the right fender.
I would replace the lock cylinder.
The timing on y our 1987 Chevy Celebrity is controlled by the engine computer, there is no way provided to adjust it.
The idle speed on a 1987 Chevy Celebrity is controlled by the engine computer, there is no way provided to adjust it.
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The fuel filter on a 1987 Chevy Celebrity is next to the fuel tank on the driver's side of the car/
The heater core in a 1987 Chevy Celebrity is in the heater plenum to the right of the hump and below the glove compartment.
I had a similar experience with my 1987 Chevy Celebrity. In my car's case I replaced the ignition module and the crankshaft position sensor. Between the two the problem seems to be fixed.
The timing on a 1987 Chevy Celebrity is controlled by the engine control module, there is no provision for adjustment.
Check your alternator switch , I had the same problem before , it was loos ..good luck